EP1164735B1 - Verfahren und vorrichtung zur beseitigung von störsignalen - Google Patents

Verfahren und vorrichtung zur beseitigung von störsignalen Download PDF

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Publication number
EP1164735B1
EP1164735B1 EP01900770A EP01900770A EP1164735B1 EP 1164735 B1 EP1164735 B1 EP 1164735B1 EP 01900770 A EP01900770 A EP 01900770A EP 01900770 A EP01900770 A EP 01900770A EP 1164735 B1 EP1164735 B1 EP 1164735B1
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EP
European Patent Office
Prior art keywords
signal
interference
directivity
replica
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01900770A
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English (en)
French (fr)
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EP1164735A4 (de
EP1164735A1 (de
Inventor
Kenichi Miyoshi
Kazuyuki Miya
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication date
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Publication of EP1164735A1 publication Critical patent/EP1164735A1/de
Publication of EP1164735A4 publication Critical patent/EP1164735A4/de
Application granted granted Critical
Publication of EP1164735B1 publication Critical patent/EP1164735B1/de
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891—Space-time diversity
    • H04B7/0897—Space-time diversity using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H04B1/71075—Parallel interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

Definitions

  • the present invention relates to an interference signal canceling apparatus, which is mounted on a base station apparatus used in a base station apparatus used in a mobile communication system of CDMA (Code Division Multiple Access) and which is used in combination with an array antenna, and relates to its interference signal canceling method.
  • CDMA Code Division Multiple Access
  • An array antenna is known as an apparatus for eliminating the interference.
  • the array antenna is an antenna that is capable of setting reception directivity freely to intensively receive only a desired signal by providing adjustment of each of amplitude and phase to a signal received by each antenna element after multiplying the received signal by weighting factor (hereinafter referred to as "reception weight").
  • an interference signal canceling apparatus that cancels signals (interference) transmitted from users other than a desired user from received signals so as to extract a desired signal.
  • the interference signal canceling apparatus when the array antenna and the interference signal canceling apparatus are simply combined, the interference signal canceling apparatus must be individually provided every channel corresponding to each user, and this increases the amount of calculations and the apparatus scale, so that some contrivance is required to be provided.
  • an interference canceling apparatus which is combined with the array antenna and which aims to reduce the amount of calculations and the apparatus scale in Unexamined Japanese Patent Publication HEI 11-205286 and the like.
  • first stage and second stage have the same configuration as illustrated in FIG. 1, the explanation of the second stage is omitted.
  • antennas 11-1 and 11-2 form an array antenna, and a signal (hereinafter referred to as "first received signal") received by the antenna 11-1 is inputted to ICUs (Interference Canceling Units) 12-1 to 12-3 and a delayer 13-1. Similarly, a signal (hereinafter referred to as “second received signal”) received by the antenna 11-2 is inputted to ICUs (Interference Canceling Units) 12-1 to 12-3 and a delayer 13-2.
  • ICUs 12-1 to 12-3 are provided to correspond to users 1 to 3, respectively, to generate replica signals in connection with the first received signal and the second received signal (hereinafter referred to as "first replica signal” and “second replica signal”, respectively).
  • the first replica signals generated by ICUs 12-1 to 12-3 are inputted to adders 14-1 and 15-1 and the second replica signal generated by ICUs 12-1 to 12-3 are inputted to adders 14-2 and 15-2.
  • the configuration of ICUs 12-1 to 12-3 will be described later.
  • the delayers 13-1 and 13-2 delay the received signals by processing time of ICUs 12-1 to 12-3, and each outputs the resultant to each of the adders 14-1 and 14-2.
  • the first replica signal of each of the respective users 1 to 3 is subtracted from the first signal.
  • the second replica signal of each of the respective users 1 to 3 is subtracted from the second signal. This cancels all replica signals of all users from the received signals of the respective antennas.
  • the output signals of adders 14-1 and 14-2 from which the replica signals of all users are canceled from the received signals are referred to as a first residual signal and a second residual signal, respectively.
  • the first residual signal and the second residual signal are inputted to adders 15-1 and 15-2 and the delayers 13-1 and 13-2 of the second stage.
  • the adder 15-1 adds the first replica signal and the first residual signal on a user-by-user basis .
  • the adder 15-2 adds the second replica signal and the second residual signal on a user-by-user basis. This cancels the interference signal from the received signal on an antenna-by-antenna basis so as to obtain a desired signal. Namely, for example, when attention is paid to user 1, the signal of user 2 and the signal of user 3, which cause interference with user 1, are eliminated from the received signal to obtain a desired signal about user 1 every antenna. The same is applied to the signal of user 2 and the signal of user 3. The obtained desired signals are inputted to ICUs 12-1 to 12-3 of the second stage, respectively.
  • the same processing as performed in the first stage is repeated in the second stage, so that the accuracy of replica signal is improved and that of the interference signal cancellation is improved.
  • the more the number of stages are increased the more the inference signals about the respective users sent from the other users are canceled.
  • the output signals of the adders 15-1 and 15-2 of the second stage are demodulated by the ICUs 16-1 to 16-3. This obtains demodulated signals 1 to 3 of the users 1 to 3.
  • the configuration of each of the ICUs 16-1 to 16-3 will be described later.
  • FIG. 2 is a block diagram illustrating a schematic configuration of ICU 12-1 illustrated in FIG. 1
  • FIG. 3 is a block diagram illustrating a schematic configuration of ICU 16-1 illustrated in FIG. 1.
  • the ICU 12-1 is divided into a front stage S1 where the signals received by the respective antennas 11-1 and 11-2 are subjected to despreading and then the resultants are multiplied by reception weights of the receptive antennas, respectively; a middle stage S2 where RAKE combining and temporary determination are carried out; and a back stage S3 where the signal subjected to temporally determination is multiplied by a replica weight to perform re-spreading so as to generate a replica signal.
  • the first signal received by the antenna 11-1 is inputted to a despreader 21-1 and the second signal received by antenna 11-2 is inputted to a despreader 21-2.
  • the despreader 21-1 provides despreading to the first received signal to generate a despread signal X1.
  • the despreader 21-2 provides despreading to the second received signal to generate a despread signal X2.
  • Despread signals X1 and X2 are inputted to multipliers 22-1, 22-2, and a reception weight calculator 23.
  • the reception weight calculator 23 calculates weights W1 and W2 of each antenna, and outputs the resultants to multipliers 22-1 and 22-1, and a complex conjugate calculator 30-1 and 30-2.
  • the RAKE combiner 27 provides RAKE combining to the signals of the respective paths P1 to P3 subjected to array combining, and a determining device 28 performs temporarily determination to the RAKE combined signal outputted from the RAKE combiner 27.
  • a signal d which has been subjected to temporary determination and which outputted from the determining device 28, is inputted to the multiplier 29 of the back stage S3.
  • the multiplier 29 of the back stage S3 multiplies the signal d subjected to temporary determination by the channel estimation value h a for each of paths P1 to P3, and the resultants are inputted to multipliers 31-1 and 31-2, respectively.
  • the multipliers 31-1 and 31-2 multiply the output signals of the multiplier 29 by the complex conjugates W1* and W2* of reception, respectively. This obtains replica signals Xr1 and XR2 corresponding to X1 and X2 respectively.
  • the adder 33-1 adds the replica signal Xr1, which has been re-spread for each of paths P1 to P3, to generate a first replica signal and outputs the first replica signal to an adder 15-1.
  • the adder 33-2 adds the replica signal Xr2, which has been re-spread for each of paths P1 to P3, to generate a second replica signal and outputs the second replica signal to an adder 15-2.
  • the ICU 16-1 of the third stage has substantially the same configuration as that of the front stage S1 of the ICU 12-1 and that of the middle stage S2. Accordingly, the same reference numerals are added to the same configuration parts as those of the ICU12-1 of FIG. 2, and the explanation of the ICU 16-1 of the third stage will be omitted.
  • the output signal of the determining device 28 of the ICU 16-1 is outputted to an external apparatus (not shown) as a demodulation signal.
  • the conventional signal canceling apparatus generates the replica signal every antenna that form the array antenna so as to improve the reduction in the amount of calculations and the circuit scale.
  • JP-A-101904905 discloses a multistage interference canceller equipment and interference canceller method for use, for example in CDMA multibeam-antenna communication system including in each stage an interference canceller unit which has a replica signal generator which generates from an input beam signal a first interference replica signal and output a first error signal and an interference removal unit which receives from another replica signal generator a second interference replica signal, multiplies that second interference replica signal by conversion coefficients and subtracts an obtained signal from the first interference replica signal to produce a second error signal so that an error signal is generated for each signal beam from the interference replica signals of a local signal beam and other signal beams to eliminate interference.
  • an interference canceller unit which has a replica signal generator which generates from an input beam signal a first interference replica signal and output a first error signal and an interference removal unit which receives from another replica signal generator a second interference replica signal, multiplies that second interference replica signal by conversion coefficients and subtracts an obtained signal from the first interference replica signal to produce a second error signal so that an error signal is generated for
  • JP-A-11266180 discloses an array antenna system of a wireless base station in a CDMA mobile communication having a beam former for forming a plurality of electric beams by applying a beam forming to multipath signals received by a plurality of antenna elements of an array antenna and inputting the beams to despreading/delay-adjusting units (fingers) provided for respective path of multipaths.
  • Each finger despreads each of the plurality of beams input thereto.
  • a beam selector selects despread signals for which desired signal components are large from all beams of all paths, a combiner weights and combines the selected despread signals, and a decision unit decides data based upon the combine signal.
  • It is an object of the present invention is to provide an interference signal canceling apparatus, which is used in combination with an array antenna and which has a small amount of calculations and a small circuit scale, and its interference signal canceling method.
  • this embodiment explains a case in which the signals, which are transmitted from the respective users and which come via the respective paths, are divided into some groups based on the direction of arrival to form a directivity on a group-by-group basis and to perform array combining.
  • antennas 101-1 and 101-2 form an array antenna, and a signal (hereinafter referred to as “first received signal”) received by the antenna 101-1 and a signal (hereinafter referred to as “second received signal”) received by the antenna 101-2 are inputted to an adaptive array section 102.
  • first received signal a signal received by the antenna 101-1
  • second received signal a signal received by the antenna 101-2
  • the adder 310-1 adds the replica signal Xr belonging to the directivity A among the replica signals Xr to generate a replica signal A, and outputs the replica signal A to an adder 106-1. Similarly, the adder 310-1 adds the replica signal Xr belonging to the directivity B among the replica signals Xr to generate a replica signal B, and outputs the replica signal B to an adder 106-2.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (4)

  1. Mehrstufige Störsignal-Unterdrückungsvorrichtung, die Störung in einem durch eine Richtgruppenantenne kombinierten Signal unterdrückt, das von einer Gruppenantenne empfangen und je nach Richtfaktor gruppenkombiniert wird, wobei die Vorrichtung umfasst:
    eine Störungsunterdrückungseinheit (103-1 bis 103-3), die auf jeder Stufe ein Nachbildungssignal eines Benutzers erzeugt,
    gekennzeichnet durch:
    eine Verzögerungseinrichtung (104-1, 104-2), die auf einer anderen als einer abschließenden Stufe ein empfangenes Signal um eine Verarbeitungszeit der Störungsunterdrückungseinheit verzögert;
    eine Unterdrückungseinrichtung (105-1, 105-2), die Nachbildungssignale aller Benutzer aus dem empfangenen Signal jedes Richtfaktors entfernt und ein Restsignal des Benutzers gewinnt;
    eine Addiereinrichtung (106-1, 106-2), die das Nachbildungssigrial und das Restsignal pro Benutzer addiert und das Ergebnis an eine Störungsunterdrückungseinheit einer nächsten Stufe ausgibt, wobei die Störungsunterdrückungseinheit umfasst;
    eine Richtfaktor-Auswähleinrichtung (301), die das durch die Richtgruppenantenne kombinierte Signal je nach Weg auswählt;
    eine Entspreizungseinrichtung (302), die einen Korrelationswert zwischen dem ausgewählten, durch die Richtgruppena ntenne kombinierten Signal und einem Spreizcode erfasst;
    eine Kombiniereinrichtung (305), die erfasste Korrelationswerte kombiniert, um einen kombinierten Wert zu erzeugen;
    eine Einrichtung (306) zum vorübergehenden Bestimmen, die den kombinierten Wert vorübergehend bestimmt, um einen vorübergehenden bestimmten Wert zu erzeugen;
    eine Rückspreizeinrichtung (308), die den vorübergehend bestimmten Wert rückspreizt, um ein rückgespreiztes Signal zu erzeugen;
    eine Unterteilungseinrichtung (309), die rückgespreizte Signale für jeden Richtfaktor je nach Weg sortiert; und
    eine Addiereinrichtung (310-1, 310-2), die die für jeden Richtfaktor rückgespreizten Signale addiert, um ein Nachbildungssignal zu erzeugen.
  2. Störsignal-Unterdrückungseinrichtung nach Anspruch 1, wobei die Unterdrückungseinrichtung (105-1, 105-2) Nachbildungssignale von anderen Benutzern in dem durch die Richtgruppenantenne kombinierten Signal unterdrückt.
  3. Basisstationsvorrichtung mit einer Gruppenantenne (101-1, 101-2) und einer mehrstufigen Störsignal-Unterdrückungsvorrichtung nach den Ansprüchen 1 und 2.
  4. Störungsunterdrückungsverfahren zum Einsatz in einer mehrstufigen Störungsunterdrückungsvorrichtung, die Störung in einem durch eine Richtgruppenantenne kombinierten Signal entfernt, das von einer Gruppenantenne empfangen wird und je nach Richtfaktor gruppenkombiniert wird, wobei das Verfahren in einer Störungsunterdrückungseinheit die folgenden Schritte umfasst:
    Eingeben einer Vielzahl gruppenkombinierter Signale, die Gruppen-Kombination je nach Richtfaktor unterzogen werden, um ein gruppenkombiniertes Signal auszuwählen, das einem Weg entspricht;
    gekennzeichnet durch:
    Erfassen eines Korrelationswertes zwischen dem ausgewählten gruppenkombinierten Signal und einem Spreizcode;
    Kombinieren erfasster Korrelationswerte, um einen kombinierten Wert zu erzeugen;
    vorübergehendes Bestimmen des kombinierten Wertes, um einen vorübergehend bestimmten Wert zu erzeugen;
    Rückspreizen des vorübergehend bestimmten Wertes, um ein rückgespreiztes Signal zu erzeugen;
    Sortieren rückgespreizter Signale für jeden Richtfaktor je nach Weg; und
    Addieren der für jeden Richtfaktor sortierten rückgespreizten Signale, um ein Nachbildungssignal zu erzeugen; und
    Unterdrücken von Störung eines gewünschten Signals in jedem gruppenkombinierten Signal unter Verwendung der erzeugten Nachbildungssignale.
EP01900770A 2000-01-19 2001-01-15 Verfahren und vorrichtung zur beseitigung von störsignalen Expired - Lifetime EP1164735B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000010877 2000-01-19
JP2000010877A JP3515033B2 (ja) 2000-01-19 2000-01-19 干渉信号除去装置及び干渉信号除去方法
PCT/JP2001/000205 WO2001054328A1 (en) 2000-01-19 2001-01-15 Interference signal removing device and interference signal removing method

Publications (3)

Publication Number Publication Date
EP1164735A1 EP1164735A1 (de) 2001-12-19
EP1164735A4 EP1164735A4 (de) 2002-11-05
EP1164735B1 true EP1164735B1 (de) 2005-11-02

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US (1) US6944208B2 (de)
EP (1) EP1164735B1 (de)
JP (1) JP3515033B2 (de)
CN (1) CN1153392C (de)
AU (1) AU2554001A (de)
DE (1) DE60114511T2 (de)
WO (1) WO2001054328A1 (de)

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JP2002374227A (ja) * 2001-06-13 2002-12-26 Nec Corp マルチユーザ干渉除去装置
GB2384662B (en) * 2002-01-25 2004-03-24 Toshiba Res Europ Ltd Receiver processing systems
GB2384661B (en) * 2002-01-25 2005-04-20 Toshiba Res Europ Ltd Receiver processing systems
GB2384664B (en) 2002-01-25 2004-12-22 Toshiba Res Europ Ltd Receiver processing systems
GB2384660B (en) * 2002-01-25 2004-11-17 Toshiba Res Europ Ltd Reciever processing systems
GB2384665B (en) 2002-01-25 2004-11-17 Toshiba Res Europ Ltd Reciever processing systems
WO2004088867A1 (ja) * 2003-03-31 2004-10-14 Fujitsu Limited 受信装置
US7437135B2 (en) 2003-10-30 2008-10-14 Interdigital Technology Corporation Joint channel equalizer interference canceller advanced receiver
US7400692B2 (en) 2004-01-14 2008-07-15 Interdigital Technology Corporation Telescoping window based equalization
EP1722499B1 (de) * 2004-03-05 2011-02-16 NTT DoCoMo, Inc. Empfängervorrichtung, empfangsverfahren und drahtloses kommunikationssystem
US8195241B2 (en) 2009-12-23 2012-06-05 Northrop Grumman Systems Corporation High-performance cellular telephone receiver
JP7774357B1 (ja) * 2025-03-21 2025-11-21 インターステラテクノロジズ株式会社 フェーズドアレイアンテナ及び制御方法
JP7774356B1 (ja) * 2025-03-21 2025-11-21 インターステラテクノロジズ株式会社 フェーズドアレイアンテナ及びキャリブレーション方法

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JP3311943B2 (ja) 1996-10-18 2002-08-05 松下電器産業株式会社 干渉信号除去装置
JPH10190495A (ja) * 1996-12-20 1998-07-21 Fujitsu Ltd 干渉キャンセラ
JPH11331125A (ja) 1997-12-04 1999-11-30 Sanyo Electric Co Ltd 無線受信システム
JPH11168408A (ja) * 1997-12-05 1999-06-22 Fujitsu Ltd 干渉キャンセラ装置
JP2991179B2 (ja) * 1998-01-08 1999-12-20 日本電気株式会社 Ｃｄｍａマルチユーザ受信装置
JP3328930B2 (ja) * 1998-02-13 2002-09-30 日本電気株式会社 適応受信装置
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JP2965202B1 (ja) * 1998-04-07 1999-10-18 日本電気株式会社 マルチユーザ受信装置及びｃｄｍａ通信システム
JP2970656B1 (ja) * 1998-06-25 1999-11-02 日本電気株式会社 Ｄｓ−ｃｄｍａマルチユーザ干渉キャンセラ
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DE60114511T2 (de) 2006-06-01
DE60114511D1 (de) 2005-12-08
AU2554001A (en) 2001-07-31
EP1164735A4 (de) 2002-11-05
EP1164735A1 (de) 2001-12-19
WO2001054328A1 (en) 2001-07-26
CN1358371A (zh) 2002-07-10
US6944208B2 (en) 2005-09-13
JP3515033B2 (ja) 2004-04-05
CN1153392C (zh) 2004-06-09
JP2001203593A (ja) 2001-07-27
US20030067971A1 (en) 2003-04-10

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